My 125 growout tank is starting to get a little dirty as the fish get bigger. Right now I have 2 large severums, 2 5in jd's, a 6in belly crawler pike, a 3in jag, 4 5in tinfoil barbs, 2 3in silver dollars, a 2in brichardi, a 7in pleco and an 8in spotted bullhead. Filtration is a rena xp4 and a large HOT filter. I thought about taking off the HOT filter and adding another xp4. What do you guys recomend for more filtration?